Figure 1-13. Schematic of the optical system for OCT imaging of the retina. A condensing lens is used to image the retina onto a plane inside the instrument. Operator viewing of the retina is provided by a standard imaging system. A computer controlled scanning mirror is used to position and scan the OCT beam. A focussing lens is used to focus the OCT beam onto the image plane where the retina is imaged. The condensing lens, in turn, relays the image of the OCT beam onto the retina. The OCT beam delivery is designed so that the OCT beam pivots about the pupil of the eye as it is scanned, thereby minimizing vignetting and distortion.

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